Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Boiler furnaces
Condensation of steam in condenser
Melting of ice
None of these

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Heat and Mass Transfer
In counter flow heat exchangers

One fluid is in hottest state and other in coldest state at inlet
Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
Both the fluids at exit are in their hottest state
Both the fluids at inlet are in their hottest state

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